[PD-dev] Segfault without messages

[Brian Neltner]

Dear PureData developer list,

I have recently switched from Max/MSP to PureData as I like the fact
that it runs on linux and also like that it is open source. I am using
it for a big project in order to analyze audio using the aubio plugin,
and then based on the analysis output open sound control packets using
packOSC and sendUDP to a locally running server which will control a
large number of LED lights.

The program I am using to analyze the music and output control signals
is pretty basic, but for some reason after running for an hour or two,
PureData inexplicibly segfaults without any debug messages even at
pdextended -d 10. I assume at that point any debug messages that are
being generated are being printed, so something is happening for which
there is no debugging handler to explain the problem.

I have attached the offending script. It is running on ubuntu 10.04
using the PD repository for lucid, and is using the pd-aubio library
from that distribution, with the external copied
from /usr/lib/pd/extras/ to /usr/lib/pd-extended/extras/

Literally the output from running in the terminal before crashing is:

pd ping;
pd ping;
... (repeated)
pd gui; pd process exited
Segmentation Fault

Not very useful...

Thanks for any help... I was planning to try to use pd to control the
lighting at a pretty big show next week, so this really is throwing a
wrench into my plans. It would definitely be a major pain to have to
reimplement this in C or something =/

Sincerely,
Brian Neltner
-------------- next part --------------
#N canvas 702 99 640 571 10;
#X msg 134 504 disconnect;
#X obj 23 471 packOSC;
#X obj 23 533 udpsend;
#X floatatom 62 501 5 0 0 0 - - -;
#X msg 134 479 connect localhost 2223;
#X obj 6 20 adc~ 1 2;
#X obj 6 55 +~;
#X obj 6 91 /~ 2;
#X obj -54 181 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144
-1 -1;
#X obj 6 116 aubioonset~ 0.2;
#X obj 49 67 dac~ 1 2;
#X obj 23 140 env~;
#X obj 23 169 / 100;
#X floatatom 23 246 5 0 0 0 - - -;
#X msg 23 221 set \$1;
#X msg 23 446 sendtyped /event/onset f \$1;
#X floatatom 93 249 5 0 0 0 - - -;
#X floatatom 176 249 5 0 0 0 - - -;
#X obj 23 272 range;
#X msg -74 233 0;
#X msg -38 233 1;
#X floatatom 23 301 5 0 0 0 - - -;
#X obj 93 273 + 0.0001;
#X obj 176 273 - 0.0001;
#X obj 23 195 history 10;
#X obj 176 224 max 0.7;
#X obj 93 224 min 0.5;
#X text 117 100 This audio filter detects an onset using aubio. If
one is detected \, it uses a continually calculated envelope with a
10ms history-based filter to eliminate spikes to control the brightness.
The brightness is then scaled according to a running min/max calculation.
However \, the min/max function constantly moves back out towards the
defined absolute minimum min and minimum max so that it can dynamically
autoscale.;
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